[RESEND PATCH v4 5/5] sysctl: delete six_hundred_forty_kb to save 4 bytes

From: Wen Yang
Date: Tue Oct 08 2024 - 11:17:55 EST


By directly encoding specific numbers into the min/max field,
unnecessary global variable six_hundred_forty_kb can be removed,
saving 4 bytes

Signed-off-by: Wen Yang <wen.yang@xxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Joel Granados <j.granados@xxxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
kernel/sysctl.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 05197d46007d..c8460b5e0605 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -90,13 +90,6 @@ EXPORT_SYMBOL_GPL(sysctl_long_vals);

#if defined(CONFIG_SYSCTL)

-/* Constants used for minimum and maximum */
-
-#ifdef CONFIG_PERF_EVENTS
-static const int six_hundred_forty_kb = 640 * 1024;
-#endif
-
-
static const int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;

@@ -1964,10 +1957,10 @@ static struct ctl_table kern_table[] = {
.procname = "perf_event_max_stack",
.data = &sysctl_perf_event_max_stack,
.maxlen = sizeof(sysctl_perf_event_max_stack),
- .mode = 0644,
+ .mode = 0644 | SYSCTL_FLAG_MIN | SYSCTL_FLAG_MAX,
.proc_handler = perf_event_max_stack_handler,
- .extra1 = SYSCTL_ZERO,
- .extra2 = (void *)&six_hundred_forty_kb,
+ .min = 0,
+ .max = 640 * 1024,
},
{
.procname = "perf_event_max_contexts_per_stack",
--
2.25.1